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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41e3c3ecce3f0b4d0e492232b7655ce299abec2cdd0f02fa5e44e5b30ece1fa' 
  AND token = 'Dgq4TXe2k9WWENHvAVeVq5n2BQY39kh00mlz9h3ka+s=' 
  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"
    }
  }
}