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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b1a7f1f0b2651f43f17fe1c73d033de8d2feb3bf988016380291f17600aee0' 
  AND token = 'LTNPK7EWTsQHX7DWbtlMp/TnxGGlRO07runC/PUz6s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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