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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc8ea4cb075af72c1651d6844fe32c0d7c1da2f2ecb067181cfc1c39b05c3f3' 
  AND token = '6PsABGyui/itZdX580+QGU85v+AoWh8uUoLmE/d5ku8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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