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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5c0a67d266061e4ba43827eb2e0f5ae348aeb0afbe5b6152b8bad792c79a8d' 
  AND token = '4J04mMdbtUwbyPwy9fQgxni6ejTnN2SbJcDY9U2p6P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}