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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b6fcabc34a1efddc4306a6ec5d427b531ab8dda1e28602a1c25a32f0b12d95' 
  AND token = 'eKvCgJBV2bEFK7y4qmlu29EG1xJRSNo0aWyeq0SC4ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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