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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75095cc65f5593af025cf676406eba679658f7856c0cd98039b91426b99bf29c' 
  AND token = 'EMcc6KcgeeJWK/ZoHfQ0qhppEAoXXA7TxMcuRf6YXWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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