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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e631b1859b69fa4749e691e0771736e1c08fcca15323b7ac340744db0b69fd2' 
  AND token = 'ZXiSEc7fpyAUlN1oTahoX8NlpsvkqwfB1o1aVD1ZoeU=' 
  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"
    }
  }
}