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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c050c4da9c3ce058bb5f42e7b9a7a54addd301d6415db0306778151262d0dc53' 
  AND token = 'PLiFEdIix9u86Wi+zZ4v5cJff+dq5LzU35fdb/BcFTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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