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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ab14cbc32a795136a93f96988ff2f0af6f7006ce820ce7152c85d4d5f8944b' 
  AND token = 'tQd4KYiOF5tIL/c1GdUgei6ddN3CFKd6Qg5RjejLpJ0=' 
  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"
    }
  }
}