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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63a73c6ce9e2e7d1a06d08e44ba5773906406f2b03c2ac615f8326161760050' 
  AND token = 'R9COo/zgXY5MyWIr2o91MVQlAq+q2aHqB7+V5Oz5U/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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