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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d77501787ce02cb48851c0924f29e23feec31998facd5ea235e46f10f49ac2' 
  AND token = '+nranoL5TMj2it+cg6X15+N2TGmhs0iKq9Y9tPGsdXo=' 
  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"
    }
  }
}