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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a21505cd7d6b458cd20cdcb8bb6409e612b293b252124486e356b0b10e6cf2d8' 
  AND token = '+AkE3jqZfyVtNKRqHmdrxHGpV7QFHev+n2CEKlCkri4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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