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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc9a845cc7eae3f25e2c6d00a22bca0e06e7c2a82837d3bc441c82e4eb9c978' 
  AND token = 'tPbkUUXm3/AgQR6HtWgSFy4rXzyEeF4lJOIhDrVZFyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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