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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e1134f36babb7f8dc92a9043d77b3a5dc83118fe059e92c38a15271f681c9d' 
  AND token = 'MnPp7h4bdzZF0jgkQ8SZEeGY+S1uMIeZF7GCkJ8EIbQ=' 
  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"
    }
  }
}