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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d0393ca5b3e1836d80638e8717397d9d463892c0d3d2b40d455675b1aeadec' 
  AND token = 'PAwtWKf6qPNcu3OXXq+bQCjuRvPivzpRcT1JzQAwvWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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