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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c2fc6f2d120bcaa16bdc4e7a72aed83b1780fe9ede8a6b397c35daa6605009' 
  AND token = 'VZZ+ZJiGeuCNrCk3dfxGUrCxNxolKuzrQagaAMwhaw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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