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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47455dd4d8dd1652404a9e7ba0873b9ef391c3cfbb19392c8817c5c6c738792e' 
  AND token = 'W6E6085BP1p0og6LG5nEvZMcjJ/7Nq6UHyu6F8a9hnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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