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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc3af087381d78442531394af25cb9561a1b3188c3865da26abc7dbcd2bed7b' 
  AND token = '2DglI1TePDPhSKQisa47sBGL8nUSCmJwJGdHaN1/Kqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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