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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35366407dfd47a5f48b42e867b24434430f58ea8e539e4cd08cd82bb9bcfcd70' 
  AND token = 'Fk3dqVT+ETUtqGNZ/IOLVCabpZ1GGpom3svmGN/c1qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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