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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6068ba0bb2d4aa207610a5297d4bc23515cd91153f986a58187fba58c2c87736' 
  AND token = '94Yd+3x8Bluno4HyITn+7i6WqlFJnb8ecrhqGGjYA34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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