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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec97e166c4f6b5fa93deb6574c5421c0c0c58605ec23ed1de7210a7fe6528985' 
  AND token = '/X4eltsl0JT0lvrqrEAbuiXkKTVkNdyymqa2Ls+MWxQ=' 
  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"
    }
  }
}