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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060554aab658f831e50720b3c6f71bddf5f763bf9ea9d8915787fd8e994367d8' 
  AND token = 'Ji5jpjoc526Xz91dm8jV4ExnXL9ioDaABZlyJ3WsqPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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