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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b1442609be430eac62e948c442b4ef0d02f22d376016e042883c6ad7a0bf7b' 
  AND token = 'lx06svZ1oaYZHnlX1rOZtJkcEa1a46j+l031YN/7HlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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