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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de6961b792eecbf52eb9e052f57d26ae0e38a3a365b040f0f5079edfdf9586c' 
  AND token = 'rfSl6bfrQ687Nm68IfPP+T7QfhQYaYg2pkVvH05SfAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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