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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2ecffe6266b3a7357fb84b0875ea7486ed4ac9f9c6bc5526e2f609f78dd583' 
  AND token = '5rX4WHE4O1FmBdZDPEca27JMe/H0zuMkhGMm0j4S0Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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