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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad11d53fcded6d0a009fdc2f0688f600afb430a45b4ef0607318012d654d6bc2' 
  AND token = 'SYoVudZ1DY2/loBRjvE6/Yt0esKqx6+H2c19QjauxO0=' 
  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"
    }
  }
}