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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48788ac5af6e2b6c05108d65e9712e780c0f97ab13733c0565b21851486a7907' 
  AND token = 'e4r4AqVonXnqYpazoG6KBFVlB0MFT9lmRttzPnDI3nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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