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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce436f78917432b65e7132bd91af5d8ea2a96390d07f3545b319dba80201b3c' 
  AND token = 'x/5odrpByrPHdiN1PW2JI+1EfS30MMHOCDoNfswGRgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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