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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6c437407d8d3379254f697c4ed28bde1cb0f2a433ecf019ff04de7d1d6282c' 
  AND token = 'VkYwhIRBiVA0vlGXk9ALHbI/kSPiL288/TBEmVfO9hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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