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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e7f53069c8276fd85cb1b6d0dbed9fcb4de324f58fe1ab46294e2c5814b48b' 
  AND token = 'Ew4FSJedyIzYUX/1dfDqII9IoJAROzOKJ7Fae5V0aD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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