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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a9b7f1d153493af497f3a394db61046f885c622f34c95f09087a114b7a291c' 
  AND token = 'Gl2POQVMxsee9X65TCxCzZ05FK5r4rwVxZkV8kT4CzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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