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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca3f7c6ea1fa0b479ae0c91b5fea537cea8fc089069b94dbea5d0fcedb07cc8' 
  AND token = '3UP2C7t4D0mMC/9FMmpQONNBSWPZe/vP97LqO3AFsts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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