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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8e861b556bc8fe2f26945d82c1f6d5d08fa10fb903e93886aa78efdcac85db' 
  AND token = 'w/69cgRYLtcW+A3ne850tIYkeuFRasw5zOEmrBmJftM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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