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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ed88ee77c6164ed4a2284ac0154a204c1bb260b2c81f8a11ac25a8ae797a0a' 
  AND token = 'SLIYKCZ93u2WP3WK3N5/C6V3yqDYBTso4yIg+bVVv3k=' 
  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"
    }
  }
}