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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6876c78f535bad04241b839bdcd74cb8c0c9038075a264ac74700977058345b3' 
  AND token = 'AE/ni3nILNr/sMXs/RaT9UhMR1JeSP8ehyLPK+BpbL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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