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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d614b4c66e6ad97c25e1f920de5ac7861fe5dfcb60fa4ebf8bc7459d89725bf' 
  AND token = 'pQuZxlm7LgYPneesrR+vJj6pB4jtULkXNwQFzpjat9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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