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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0cae20b4cdf6538a9504262e91a5b2e2ea8c5a9728236ed756cd472e55fdae2' 
  AND token = 'VzDqqoQlPLL2bMv8EN8eM1f5O6HN0yEhNJKnTl5RAkw=' 
  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"
    }
  }
}