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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e102157fa528275b0eb90d09c781d7de70bfe3e6a688c906263c1de299ed3eb3' 
  AND token = '/CEo+nOOIyi+MgPEajfH0GaGaJOWZhAbDbaVHvCs8+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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