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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee250566f6018e94b959aba598e8f6760f995068b2699a28e056c9a78729ff7' 
  AND token = 'gCibeqznTsCFr1gZWYt/DxrVHFkZIic4WwOlbapcBC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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