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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e157f69d11cd9bbfac063938fb9b18d2b1c7597ddce2e1c17b833bdb455cedfd' 
  AND token = 'Cc/nknBx0KNlYjjL45j3HLp4Zt9LFip/BmifqxCMKj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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