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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9cbe0257dc631754cfc73a79b4af02e191bdeaf3d0b94c7e4dce82c9eaa445' 
  AND token = '3yzV/jOUWSPBLM1KNwaQmOOMjgcFygcue9nBs0fPe2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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