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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6eeb72b91cd2c202d9fd595538d25c80e50c8f0fe25a7a3dd90d4a27c7126c2' 
  AND token = 'KDICClO2Mky2tOI2iyh6XltJkIDhq7wQKhFk4rulSqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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